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        /*
        1.算数运算符 + - * / %
            除零 Infinity
            模   NaN    not a number
        2.复合算数运算符 ++ -- += -= *= /= %=
            除零 Infinity
            模   NaN    not a number
        3.关系运算符 > < >= <= != == ===
            ==      如果两端的数据类型不一致，会尝试将两端的数据都转换为number再对比
            '123' -> 123
            true  -> 1
            false -> 0
            ===     如果两端的数据类型不一致，直接返回false，相同则会继续对比
        4.逻辑运算符 || &&
        5.条件运算符 条件表达式 ? 值1 : 值2
        6.位运算符 | & ^ << >> >>>
        */
       console.log(10/2)
       console.log(10/4)
       console.log(10/0)  //Infinity
       console.log(10%0)  //NaN
       var i=10;
       console.log(i/=0)  //Infinity

       console.log(1==1)
       console.log(1=='1')
       console.log(1==true)

       console.log(1===1)
       console.log(1==='1')
       console.log(1===true)
    </script>
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